Saw setting machine



y 1932- c.. H. HART SAW SETTING MACHINE 2 sheets-sheet 1 Filed Jan. 30, 1931 INVENTOR, 4 6M0! flaw.

A TTORN E May 24, 1932.

C. H. HART SAW SETTING MACHINE Filed Jan. 30, 1931 2 Sheets-Sheet 1. INVENTOR, 6W flfla/w 5W ATTORNEY;

Patented May 24, 1932 UNITED LSTA TES CONNIE 'HABT, OF eBELLING-HAMI,'WASHINGTON SAW SETTING MAGHIN E A li ation filed'J'anuary 30, 1931. Serial' No. 512,288. a

My invention relates .to improvementsin saw sets andh as forzan object'to provide amanually-operable, saw-setting machine which will feed a saw therethrough tooth'by tooth: and set the "same tooth by toothwith a hammer blow inexact uniformity.

Another object of my improvement isxto provide saidmachinemade suitable for different sizes of saw :teeth by simple .positive adjustments.

Anothe'r object ofxmy improvement is to provide said .mac'hine-"made; suitable for simple adjustments to localize the hammer blow thereof. Other objects of my improvement will appear as the descriptionproceeds.

I attain these and other objects of my'improvement with the: mechanism illustrated. in the two sheets of drawings accompanying F120 this specification and forming a part thereof in which'Figure 1 is a plan view of my machine in section. on the bent line -11 of Fig. 2;Fig. 21-is a sideLeleVatiQn of my machine, Fig; 3 is a partial section of my machine on 1725 line 3--3 of Fig; 2; Fig. 4 is aside elevation: of the anvil in my machine'sh-ownbyzitself, and Fig. 5 is an elevation View of the hammer peen bar shown=by itself.

similaricharacters refer to similar partsin the'several views. Gertainparts are broken away to show other parts hidderr'thereby.

With"n1ore particular referenceto the designated *parts The machine base plate 6 has'legsi'ati to support the :same. A pair of -bearing brackets' 7, 7 arebolted'to-the rear part of the base disposed parallel with eaoh other and separated to provide-aspace therebetween. a

' Cam shaft8 is mounted for revolution in bearings at the top of brackets 7 and. is fastened to cam" 9 to causethe same'torevolve therewith between-brackets 7, 7 The front end of ram shaft 8 is extended and on it is fastenedhandle 1U=bywhich to revolve the .cam. F The extended part of cam 9 is shown at Beneath the cam inbearings in brackets 7 is mounted for revolution, hammer-handle shaft lluwhich is disposed within its bear- 59 ings andhasan adjustment capscrew '12, 12

engaged in each end thereof to set andretain the "shaft in desired longitudinal positions in its bearings. Hammer handle 13 is' rigidly mounted on shaft 11,-to oscillate therewith, and has an upturned rearextension 1e with an arcuate end al to contact with cam 9. Hammer 15 is an integral partof the front end of the hammer handle andhas' a longitudinal opening therein in-which-is 'fastened peen bar 16 having peen a16 on the '00 lower end thereof. Arm 17 extends'downward from the lower side of the hammer han dle and has parallel sides at the rear and a wedge-shape front edge a17.- Screweye 18 is engaged in the rear edge of arm 17 and has the forward eye of coil spring 19 engaged therewith. :The rear eye a19'of said-spring is mounted on screw 20 to be raised andlowered "thereby as said screw isrevolvedin housing 21 by turning screw capa20. Hous- 7 ing' 2l has'slot e21 in the frontthereofto allow the shank of spring eye' 62191130 pass therethrough as it is moved up and dowir by re- 7 volvingscrew 20.

Inatrtnsvers'e slot and guidewa inbase plate 6' is mountedfulcrumbar 22 or reoiprocation. "Slots a22, a;22'in said bar provide for the extension therethrough'of-cap screws 23, 23 which are'engaged in tapped holes in the bottomof the 'guideway andwrare used 0121 1111) the fulcrum bar inIde'sired-locations. Lever 24 is fulorumed on'bar i'22 by oapscrew 25 which is'extended through a hole through boss b24'thereon and engaged in a tapped hole in said fulcrum bar. .1 The 595 front end of lever24; is recessed'beneath and I stepped upward at @241 topr'o'vide a housing 'forpawl'27. On the-rear endof lever 24c isblug-26 inclinedat an angle-tobearfiatwise 'onwedge'surfa'ce a1? ofh-andle arm 17 mo when lever-24 is in its dotted position air-24:

and arm 17 is inits dotted position at 1'7.

Pawl 27 has stud 28 near one end thereofand pawl bit a27 on the other end thereof. "Said pawl stud 28 is mounted for oscillation in 595 said spring. is mountedover. said studand the I other end thereof is fastened around a post on the lever to cause the reaction of spring 29 to tend to force pawl bit e27 forward.

Lever 30 is fulcrumed on fulcrum bar 22 by cap screw 31 which is extended through end of the lever to dispose pawl 33 in the.

housing recess beneath the same. One end'of coil spring is fastened in a slot in the top of stud 34 and the other end thereof is fas tened around a post inthe top of the stepped end a30 oflever 30.' Spring 35 reacts to cause'the free :end c133 of pawl 33 to tend to move'forward. Lug 32 on the rear end of lever 30 is inclined to cause the same to lie flatwise on the wedge surface of hammer handle arm 17 when the same is in its dotted 'position'at 17' andwhen lever 30 is in its dotted position at 30.. Posts a36, e36 are disposed on levers 24 and 30 between the fulcrums and the rear ends thereof and to them, are, fastened the ends of coil spring 36 which is made tense between said posts to cause the reaction-of the spring to draw the rear ends of levers 24and 30 toward each other when either lever is free to turn on its fulcrum. Flat'strut spring 37 has its ends engaged in slots in the opposite edges of levers 24 and 30 adj acent the fulcrums thereofand reacts to maintain the opposite fulcrum-bearing surfaces of said levers in contact with their fulorums; screws 25 and: 3l,at

7 all times;

Table bar 42 is fastened to-the frontedge of base plate 6 with its upper surface in the plane of the upper surface of the base plate. Base plate 6 has'a notch in its front top edge in which are mounted selector bars 39 and 41 tobear insaid notch and also on the rear edge of table bar 42. The selector bars are of the-front ends of levers 24 and 30.- Selectorvbar39 has tapered end a39 on which 7 bears the bit (133 of pawl 33 as it reciprocates, .andfselector bar 41 has tapered end a41- on which bears bit (127 of pawl 27 as itreciprocates.

Anvil 43 is mounted for reciprocation in groove 47, a4? in plate 6 and table bar 42 and is clampable in desired positions in the groove by hand screw 53 engaged in a tapped hole 44 and which enters through slot 52 in the base plate. Screw 53' has'head 54 thereon which together with a washer covers slot 52 to provide a bearing for the screw when used in clamping. Handle in the screw head provides finger hold to turn the screw. The anvil has an inclined face, shown at 143 in Fig. 4, to determine the angularity of the 'set made in the saw teeth as one by one they are passed over this'part of the anvil. Table bar, 42 has a similar inclination, shown at (142 in ig. 2, to provide clearance for the teeth after they have been set. Anvil-43 has an opening in its side at 45 the use for which will be referred to. Spring 46 is installed in slot 47 to react between the base 6 and the rear end of anvil 43 to force the anvil forward in the slot. Adjusting bolt 48 is extended through an opening in. plate 6 from the right-hand side thereof to anvil slot 47 andhasa threaded body 49 and a conicalpilot end '50, a50, and is disposed to.

cause conical end 050 thereof to enter and bear against the rear wall of opening 45 in the anvil. Threaded body 49 engages in the threaded-inner end of said base opening and as bolt 48 is revolvedforward cone e50 enters further in hole 45 and anvil 43is driven I thereby against the reaction of springr46 toward the back of thebase. 1 By turning bolt 48 backward cone 050 is withdrawn from hole 45 and spring 46 forces the anvil forward in the base slot.

clamping screw 53 thereof is out'of clamping position.

Post 51 is centrally placed on base 6 be neath hammer handle 13 and is of a height before contact with the same has been attained.

A fragmentary portion of a saw blade is shown indotted outline at A and tooth B thereof is centrally disposed'on the anvil as shown in Fig. 1. 3

'In operation: As illustrated in full lines These longitudinal movements of the anvil can occur only when in Fig. 2, end a9 of cam 9is in contact with end 1114 of the rear extension 14 of the ham- 'mer handle 13' causing hammer head 15 and peen a16 to be in the most elevated positions to which they may attain. Arm 17 of the hammer handle is in its most'forward position retaining lever 24 -.=in its most advanced operative position with bit a27 of pawl 27 in its most advanced position toward the left bearing against sawtooth B which is centrally disposed on anvil 43 on the spot to receive a blow from hammer peen 41116 when the same descends, as shown in Fig. 1. But the cam tip is very close to the edge of arcuate' handle end a14 and the forward turning of crank handle 10 few degrees L'IHOVG forward to their dotted-outline posiations at 14, a14-with.handle end albearingonthe inner-part of thecam at 69. At :the same time hammer handle 13,;hammer head 15'and peen bar'16 have moved to their lowest positions, indicated in dotted outline and marked with the primes of said designating characters, with hammer peen e16 bearing on saw tooth B which wasstruck a ;blow thereby. By construction the hammer structure is. overbalanced in weight forward of fulcrum shaft 11 and this together with the reaction of spring 19 caused theblow on tooth B struck by the hammer to be sufficient for the purposedesired, that is, to cause the :tooth to, not only be bent to the shape of the anvil face on'which it lies, but

also to be set to remain in said shape.

'When setting saw teeth with the ordinary saw setting; device they are forced over into the position beyond which it is desired they shall retain because they will spring back'by the resiliency of the metal to occupy a less angular position. There is, therefore, some uncertainty as to the exact position assumed by saw teeth set by said usual setting device, and also there is danger of breaking the teeth when they are thus forced over to the extreme position required simply by pressure. But with the hammer blow delivered through peen (116. which conforms to the shape of the anvil face. the tooth is 'bent into the desired angularity while the metal thereof is vigorously agitated and flows into the new shape thus causing the set of the 'tooth to exactly conform to the anvil shape resulting in uniformity of theset of the several teeth oft-he saw.

Duringrthe time the hammer. was descending arm 17 thereon moved rearward from'its position shown in section at 17 in Fig. 1 to its position shown in dotted outline at 17 in Fig. 1 and also shown in elevation in Fig. 2. In Fig. 1 lever-30 is shown in full lines with its front end bearing on block 40 and its fulcrum screw 31 engaged inyslide 22-which is clamped to the base 6 by screws '23. Therefore lever 30' is retained in a stationary position during its period of being out of action and spring 36 connected therewith is now fastened to a stationary part of the mechanism. Said spring is also connected with the 1 rear end of lever 24 and reacts to cause lug26 thereon to move to its dotted position shown in dotted lines at 26 as rapidly as arm 17 moves rearward to allow the same. The left hand movement of the rear end of lever 24 rcauses a-corresponding right-hand movement of the front end thereof and pawl 27 is withdrawn to its dotted position at 27 withits bit at (727 on selection bar 41 by the time the hammer peen delivers its blow on the saw tooth.

It is assumed that the revolution of hand crank 10 is continuous during the setting ofrone sideof the:sawisonthatncamifi :coritinues: forwardrevolutions ands-the -in- I creasing diameter of the cam "surface: passing by arcuate end @2114 of thezrear hammer handle een'd forces the same backward causing arm 17 'toswing forward and. the inclined surface I of the front partxa17; thereof forces lug: 26

toward the right and the front end with pawl 27 thereon toward the left and bit (L27 drops over the tapered end of selection bar 41. and engageswit'h thesecond .toothxto the right from said tooth B, said selection bar having been set in the proper positioni'to lead the'rbit to said engagementnnder the reaction: of

spring 29. lThe continued movement of the inclined surface. a17 :forward-ucauses pawl I 27. to feedthe. saw blade 5A toward the left till the tooth against which bit a27 is pressingiscarried to a central-position on the :anvil at the spot to be struck by the next hammerhblow "when arm 17- has reached a point in its forward swingiwhere tlieinclined surface thereof joins the side wallthereof whichthen bears. onlug 26 and the outward swing of the lug ceases as. alsodoes the left-hand movement of pawl arena the said saw tooth is allowed to remain properly spotted on the anvil for the next hammer blow which again is released by the passing of cam end a9 beyond hammer armxend (114 and the hammer descends as beforewhile pawl 27 is withdrawnand peena16 contacts wvith the saw tooth spotted on the anvil prothen right-hand end thereof is placed where bit a83-of vpawl 33 may engage therewith.

Meanwhile clamp serews23,l23 have been A loosened and slidable fulcrum bar 22 has been set in its dotted position at 22 causing lever '24 to occupy its fixed position at 24" andlever 30 to occupy its operative position atf30.

1 Then the revolution of crank 10 continues 'as before and the unsetalternating teeth of the saw one at a time are spotted on anvil face (Z43 by oscillating pawl 83 each in turn to be given a blow by hammer peen a16while thus spotted till allof the teeth of the saw have been set to uniformity.

When it is desired to decrease the amount of set given the teeth, screw 54-is loosened by turning handle 55 thereonand screw bolt 48 is turned forward to cause conical pilot a50 to enter further in hole 45 and force the anvil by which less of the inclined face of theanvil is disposed beneath the saw. 'To increase the moved forward by thespring and disposes more of the saidinclined anvil face beneath the saw. It has been found desirable-in pracrearward against the reaction of spring 46 7 tice to clamp the anvil in its slot during use principally to prevent the entry of particles of filings between the same and the bottom of the sloton which it bears.

The teeth of saws which this machine is more especially suited for setting vary 'in size requiring difierent ranges in oscillation of pawls 27 and 33 in order that two of the teeth may be fed over the anvilduring each pawl movement.

There are several adjustments which together attain this end. The distance of the fulcrums of levers 24 and 30 from the center line through arm 17 and the anvil affects the length of movement of pawls 27 and 33. The disposition of pivot fulcrum screws 25 and 31 is controlled by the location of fulcrum bar 22 in its slideway which is easily adj usted as explained. The stability of the fillcrum axes of said levers is assured by strut spring 87 relative to the fulcrum bar because this spring maintains the bearings of the levers on opposite sides of screws 25 and 31.

5 Theflongitudinal adjustment of the disposition of hammer handle shaft 11 in brackets'7, 7' is made by cap screws '12, 12 in the ends thereof, as explained, whereby the lateral disposition of the blows from hammer peen LL16 is determined. And the distance of the ends of selection bars 39 and 41 from anvil 43 is adjusted by setting these bars, as explained,

. to cause the bits of the pawls to engage with the desired saw tooth as they drop over the ends of said bars. By these several simple adj ustments the delivery of the blows from the hammer peen centrally on each tooth while it is spotted on the anvil can be attained.

Having thus disclosed my invention, what I claim as new therein and desire to secure by Letters Patent is,

1. A saw setting machine including a base,

-a bearing bracket fastened to the base, a hammer handle mounted in a bearing on the bracket for oscillation in a vertical plane, means to adjust the position of the hammer handle longitudinally of its axis of oscillation, a hammer having a peen thereon fastened on the front end of the hammer handle, a cam mounted for revolution in a bearing on the bracket disposed to bear on the rear end of the hammer handle to'raise and drop the hammer during each revolution thereof,

means to revolvethe cam, an arm fastened to the hammer handle extended downward therefrom proximate to the base to oscillate reciprocation of the fulcrum bar, means to releasably fasten the fulcrum bar to the base,

an anvil fastened on the base beneath the hammer peen centrally disposed between the'stop blocks, and a pawl pivoted on the front end of each of the levers disposed to engage with a tooth of a saw to move and spot the same on the anvilbeneath the hammer peen when said lever end oscillates. c

2. A saw setting machine including a base, bearing brackets on the base, a hammer handle mounted for oscillation in a vertical plane in hearings on the brackets, a hammer having a peen thereon fastened on the front end of the hammer handle, an arm fastened to the hammer handle adjacent the axis of oscillation thereof to oscillate therewith, a cam mounted for revolution in bearings on the brackets to bear on the rear end of the hammer handle to raise and drop the hammer and oscillate the arm during each revolution thereof, means to revolve the cam, two levers fulcrumed on the base their rear ends disposed adjacent the arm, means to cause said levers one at a time to bear on the arm to be oscillated thereby, a spring-pressed pawl pivoted to the front end of each lever to engage a tooth of a saw tomove and spot the same on an anvil'during each oscillation of the lever, said anvil having an inclined-plane face thereon centrally disposed between the front ends of the levers, and means to move and retain the anvil to spot different parts of said inclined face thereof beneath said saw tooth and in the path of oscillation of the hammer peen.

3. A saw setting machine including a base, bearing brackets on the base, a hammer handle mounted foroscillation on the brackets on a horizontal axis, a hammer having a'peen thereon fastened on the-front end of the hammer'handle, an arm fastened to the handle adjacent said axis thereof to oscillate therewith, a cam mounted for revolution in bearings on the brackets to bear onthe rear end of the hammer handle to raise and drop the ham mer and oscillate the arm during each revolution thereof, means to revolve thecam, 7

two levers fulcrumed on the base their rear ends disposed adjacent the arm, means to cause the rear ends of the leversone at a time to bear onthe arm'to be oscillated thereby, two selective bars disposed longitudinally in line adjacent and in front of the front ends of the levers providing a space between the opposite ends thereof, means toretain and to move the selective bars longitudinally to vary the space therebetweema spring-pressed pawl pivoted to the front end of each lever to bear on the rear edge of one of the selective bars and to pass over the said opposite end thereof to engage and move the tooth of a saw disposed against the front edge of the said selective bars and spot the same on an anvil during each oscillation of the lever, said anvil having an inclined plane face thereon centrally disposed between the front ends of the levers on the base, and means to move the anvil forward and backward on the base and to retain the same to spot different parts of the said inclined face thereof beneath said saw tooth and in the path of the oscillations of said hammer peen.

CONNIE H. HART. 

